In Kentucky, Senate Minority Leader Mitch McConnell faces off against Matt Bevin, and there's little doubt McConnell will win the primary. The key is whether he can win big in evangelical areas; if he can, it's good news for him in the general election, the Wall Street Journal reports.

In Pennsylvania, Democrats are battling for a chance to run against Gov. Tom Corbett, seen as perhaps the GOP's "most vulnerable governor," Politico notes. Businessman Tom Wolf has spent $10 million of his own money on the race, and he's leading Rep. Allyson Schwartz.

In Georgia, there will almost definitely be a runoff vote in July for the Republican Senate spot. The question is who will be in it. Businessman David Perdue looks likely, the Washington Post reports, while Rep. Jack Kingston and former Georgia secretary of state Karen Handel are fighting to face him. Kingston has the Chamber of Commerce's backing, but Handel is supported by Sarah Palin.

In Oregon, a Senate race may hinge on a stalking report. Last week, Politico revealed that Republican neurosurgeon Monica Wehby's ex-boyfriend said she'd stalked him and harassed his workers; similar accusations from her ex-husband were subsequently revealed. Polls, however, still put her ahead of Rep. Jason Conger.

In Idaho, Tea Party candidate Bryan Smith is challenging GOP Rep. Mike Simpson for his seat. Simpson is a major John Boehner ally, the Journal notes, while Smith got a big push from the Club for Growth. But the Club has stopped advertising in the race, and Mitt Romney has backed Simpson, who looks likely to win.